We are using Oracle 10 G database. An .net HMI is connected to it. every seven days this HMI gets slow. this would again work fine only after restarting Oracle DB. We minimized the problem to restarting orcale services and console from Service administrator. But we are unable to resolve the issue. Can someone help in understanding why we need to restart DB? Or what all things get reset when Orcale services are restarted? Oracle version is 10.1.0!!